Improvement in oscillating engines



.l. HEMENWA-Y, 1r. Oscillating-Engines.

Patente d Sept. 22,1874.

NITED STATES PATENT OFFICE.

JASON HEMENWAY, JR, OF WESTON, ASSIGNOR TO HIMSELF AND JESSE CHAMBERLIN, OF DEERFIELD, MICHIGAN.

IMPROVEMENT IN OSCILLATING ENGINES.

Specification forming part of Letters Patent No. 155,303, dated September 22, 1874; application filed May 14, 1874.

To all whom it may concern Be it known that I, JASON HEM'ENWAY, J r., of Weston, in the county of Lenawee and State of Michigan, have invented an Improvement in Oscillating Steam-Engines, of which the following is a specification:

The first part of this invention relates to an improvement in guides for oscillating engines, whereby the piston, piston -rod, and stuffing-boxes are relieved from the labor of oscillating the cylinder, their friction and wear being reduced to that exhibited in ordinary reciprocating engines of equal power.

The invention consistsin a vertical crosshead at the end of the piston-rod, which crosshead is strapped to the crank-pin, and at each arm of the said cross-head is a guide-rod, parallel with the piston-rod, and which rods play through tubular slides cast on' the front end of the cylinder.

The second part of the invention relates to the peculiar constluction of the trunnionvalve, an annular valve-seat, and the steamchest with relation to the cylinder, as more fully hereinafter set forth.

Figure 1 is a perspective view. Fig. 2 is a plan of the engine. Fig. 3 is a cross-section through the steam-chest at as as in Fig. 2. Fig. 4 is a similar section of the steam-chest alone. Fig. 5 is a similar section of the annular valveseat alone. Fig. 6 is a horizontal section of the trunnion and a portion of the cylinder.

In the drawing, A represents the oscillating cylinder, cast with two trunnions, which are journaled in bearings at the tops of two pillow-blocks, a a, on the bed-plate B. G is the piston-rod, to whose outer end is keyed a vertical cross-head, D, which has an eye to receive the crankpin b. E E are two guiderods, one of which is secured to each arm of the cross-head, and extends back along the cylinder parallel with the piston-rod, playing in a tubular slide, F, one of which is cast with or bolted to the cylinder on top, and the other at the bottom. These guides compel the oscillation of the cylinder, as will readily be seen, and thus relieve the piston, piston-rod, and stuffingbox from the lateral friction and wear heretofore found so objectionable in oscillating engines. One of the trunnions, A, is elongated, passing through and beyond its bearing a. This trunnion has a transverse port, 0, on each side, in the same plane, from which two ports, d 61, extend back to the steam ports or passages, being separated by a septum, e. G is the steam-chest, having a circular opening through it in the axis of the trunnion, and is divided into an upper and a lower compartment by a horizontal partition, f. With the lower one the steam-pipe g connects, and with the upper one the exhaust-pipe h connects, or vice versa. H is a cylindrical sleeve, fitted steam-tight into the opening or bore in the steam-chest. It is bored slightly tapering, to take up any wear of the trunnion by forcing it farther onto it, the trunnion being turned to the same taper. In the lower edge of the sleeve is a longitudinal groove, which slides over a feather in the outer wall of the steam-chest at the bottom of the bore, to prevent the sleeve from turning, which is thus an annular valve-seat for the trunnion. There are two steam-ports, 7a 7a, in the steam-chest bore below the partition, and two exhaustports, Z l, above the partition. There are two corresponding and coincident ports in the annular valve-seat.

When the cylinder rotates the trunnions so as to disclose the ports 70 I, live steam will enter at it, pass through c 01 into the cylinder A to propel the piston in the direction of the arrow, while the exhaust will pass through d c, and through linto the exhaust-pipe. WVhen the cylinder oscillates to reverse the motion of the piston, the course of the steam and exhaust currents are reversed by the closing of the ports 70 l and the disclosing of the ports 70 I.

What I claim as my invention, and desire to secure by Letters Patent, is

In combination, a steam -chest, G, divided into two compartments by a partition, f, and having a circular chamber PIOX'ldGd with the five openings, as described, a steam-tight-fitting sleeve, H, bored tapering, and provided with openings to correspond with those in said chamber, and a tapering trunnion, A, having a port, 0, on each side, said ports being out in the same plane, and communicating by means of passages d and d with the interior of a steam'cylinder, A, substantially as described and shown.

JASON HEMENWAY, J It.

Witnesses:

H. F. EBERTS, H. S. SPRAGUE. 

